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How to Set Up Klaviyo Back-in-Stock Notification Flows for Online Stores

March 01, 2025
4 Min Read
How to Set Up Klaviyo Back-in-Stock Notification Flows for Online Stores

Introduction

In eCommerce email marketing, automation plays a crucial role in driving sales, engaging customers, and improving retention. Among the many automation tools available, Klaviyo back-in-stock notifications help merchants recover lost sales by informing customers when an out-of-stock item becomes available again. Klaviyo, a leading email and SMS marketing automation platform, enables businesses to set up personalized alerts that keep potential buyers engaged and increase conversions.

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This guide provides a thorough overview of Klaviyo back-in-stock automation, including how it works, best practices for optimization, common mistakes to avoid, and advanced strategies that maximize sales.

What Is Klaviyo Back-in-Stock Automation?

Klaviyo back-in-stock is an automation feature that notifies customers when a product of interest becomes available again. When customers opt in to receive back-in-stock messages, they automatically receive email or SMS alerts as soon as the inventory is replenished. This screenshot shows an example of a product page that provides the option to request notifications:

Back-in-stock notification example

Recent Updates & Enhancements

Klaviyo has introduced several improvements that enhance the effectiveness of back-in-stock notifications. They include AI-driven segmentation, which prioritizes alerts for high-intent customers, and enhanced personalization, which enables merchants to tailor messages based on browsing history and past purchases. Additionally, Klaviyo has strengthened its integration with Shopify, BigCommerce, and WooCommerce, providing a more seamless setup process for merchants.

By leveraging these improvements, businesses can deliver more relevant and timely messages, ultimately increasing conversions.

How Does Klaviyo Back-in-Stock Automation Work?

If an item goes out of stock, Klaviyo back-in-stock flows ensure that interested customers receive alerts when it becomes available again.

Step-by-Step Process

  1. A customer opts in by signing up for back-in-stock alerts on a product page.
  2. Klaviyo records this data and links it to the customer’s profile.
  3. When the product is restocked, Klaviyo automatically triggers an email or SMS notification.
  4. The customer receives an alert with a direct link to the product page.

Integration With eCommerce Platforms

Klaviyo integrates with various eCommerce platforms to enhance automation.

  • Shopify syncs real-time inventory updates to trigger notifications.
  • BigCommerce connects with customer databases for targeted messaging.
  • Magento and WooCommerce provide advanced segmentation options based on shopping behavior.

These integrations help ensure that back-in-stock notifications reach the right audience at the right time.

Personalization and Multi-Channel Alerts

Personalization is a key component of successful back-in-stock notifications. Email alerts are ideal for customers who engage with marketing content, while SMS notifications represent an effective way to promote time-sensitive purchases. Combining both channels can maximize engagement and drive more conversions.

Optimizing Klaviyo Back-in-Stock Flows for More Conversions

To maximize revenue from Klaviyo back-in-stock flows, businesses should focus on crafting high-converting messages, leveraging urgency, and continuously optimizing their campaigns.

Crafting High-Converting Messages

An engaging subject line encourages customers to open back-in-stock notifications. Examples of effective subject lines include:

  • “🚨 Back in Stock! Grab [Product Name] Before It’s Gone!”
  • “It’s Here! [Product Name] is Back – Order Now”
  • “Good News! Your Wait is Over – [Product Name] is Available Again”

Call-to-action buttons should create a sense of urgency. Phrases such as “Shop Now Before It’s Gone!” or “Claim Yours Today!” encourage immediate action.

Leveraging Urgency and Scarcity

Emphasizing limited stock availability increases conversions. Phrases such as “Only a Few Left – Order Now Before It Sells Out Again!” make customers more likely to act quickly.

A/B Testing for Optimization

Testing different elements of back-in-stock notifications can improve performance. To identify the most effective approach, businesses should experiment with subject lines, SMS versus email alerts, and time delays between notifications.

Benefits of Klaviyo Back-in-Stock Automation

Klaviyo back-in-stock alerts help retailers recover lost sales and improve customer engagement.

Increased Sales and Conversion Rates

Back-in-stock emails typically achieve open rates between 55 and 65 percent. Meanwhile, Total Retail reports that just under one-fifth of readers click links and about 6 percent make purchases. Some studies have found higher conversion rates ranging from 12 to 24 percent.

Reduced Customer Frustration

Shoppers who cannot purchase desired products due to stock shortages often seek alternatives from competitors. Back-in-stock notifications keep customers informed and prevent them from abandoning a brand.

Klaviyo back-in-stock messages can arrive via SMS

Improved Inventory Management

By analyzing customer requests for back-in-stock notifications, companies can gain insights into demand trends. This data helps merchants optimize restocking strategies and improve inventory forecasting.

Common Mistakes to Avoid With Back-in-Stock Notifications

Although Klaviyo back-in-stock flows are highly effective, many businesses make mistakes that reduce their positive impact.

Lack of Audience Segmentation

One of the most common errors involves failing to segment the audience properly. When a retailer sends a generic email to all subscribers instead of targeting specific customer segments, it can lead to less engagement. Personalization improves relevance and increases conversions.

Don’t send generic notifications that lack dynamic product images or personalized recommendations. Including high-quality photos and tailoring messages based on past behavior will enhance engagement.

Not Following Up

Businesses should also avoid failing to follow up. If a product sells out again before all interested customers make a purchase, merchants should send a secondary notification to those who missed out.

Ignoring Mobile Optimization

Some eCommerce retailers neglect mobile-first design. With more shoppers using mobile internet devices, it’s essential to ensure that both email and SMS alerts are optimized for mobile access. Our free performance and accessibility audit can help ensure that your website is also mobile-friendly.

How to Set Up a Klaviyo Back-in-Stock Flow

Configuring a Klaviyo back-in-stock flow involves several key steps.

Step 1: Enable Back-in-Stock Notifications

Merchants must enable back-in-stock notifications by navigating to Flows > Browse Ideas > Back-in-Stock Flow within Klaviyo.

Step 2: Customize Notification Messages

Businesses should customize their notification emails and SMS messages by adding engaging subject lines, high-quality product images, and strong CTAs.

Step 3: Define Trigger Conditions

Merchants should define trigger conditions to ensure that alerts are sent only when stock levels meet a specific threshold.

Step 4: Test the Automation

Confirm that notifications will work correctly by testing the automation before launching it.

Advanced Strategies for Back-in-Stock Flows

Businesses can take Klaviyo back-in-stock automation to the next level by implementing advanced tactics.

Cross-Sell and Upsell Automation

To increase the average order value, include personalized product recommendations in your back-in-stock emails. For example, an email alerting customers that a product is available could also suggest related items.

Behavioral Triggers for Follow-Ups

Follow-up messages based on customer actions can enhance engagement. If a shopper opens a back-in-stock notification but does not complete the purchase, you could increase conversions by sending a reminder email with an extra incentive (such as free shipping).

VIP Segmentation for Priority Access

Businesses can prioritize notifications for loyal customers by offering early access to restocked products. This strategy strengthens brand loyalty and improves buyer satisfaction.

Conclusion

Klaviyo back-in-stock flows are essential for eCommerce businesses that want to recover lost sales and keep potential customers engaged. By optimizing messaging, leveraging urgency, and implementing advanced segmentation, merchants can significantly increase their conversion rates.

For companies looking to refine their Klaviyo automation strategies, expert guidance can make a big difference. Contact Groove Commerce for professional Klaviyo setup and optimization.

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